Hi H. Miller,
How do you know it is 50%. Is it via the fuel gage or an accurate fill-up, or some other measurement? Coach fuel gages are notoriously off in their measurements.
I do not know a Beaver coach. On the coaches I do know, one would need to drop the fuel tank and install a new or altered pickup tube for the generator.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours